[PATCH] D12862: [WebAssembly] Define the atomic type sizes

[Dan Gohman via cfe-commits]

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WebAssembly's spec has now been updated to specify some [guarantees about lock free atomic accesses](https://github.com/WebAssembly/design/pull/336). Update clang to match.

This also updates sig_atomic_t to be 64-bit on wasm64. WebAssembly does not presently have asynchronous interrupts, but this change is within the spirit of how they will work if they are added.

Repository:
  rL LLVM

http://reviews.llvm.org/D12862

Files:
  lib/Basic/Targets.cpp
  test/Preprocessor/init.c

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